Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21D
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Load children
23/00
Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
Load children Filter patents View analytics View as hierarchy
E21D23/04
Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
Load children Filter patents View analytics View as hierarchy
E21D23/0481
Supports specially adapted for use in combination with the placing of filling-up materials
Filter patents View analytics View as hierarchy